2. edit config.cfg and if you want to use multiplayer, edit config_mp (before you do this please backup first)
Open with notepad and edit this strings by ctrl + F, edit the number from 1 to 0

r_multiGpu
This should only be enabled if you have multiple graphics cards or a graphics card with multiple GPUs. If you don’t have multiple GPUs, don’t know what this means, or are having issues with your MultiGPU solution, please set this to “0”.

r_multithreaded_device
This setting should be enabled for EVERYBODY as the minimum requirements for Black Ops clearly states that you need a multithreaded (multicore) CPU to run the game. However, some people have noticed that by setting this to “0” some of the skipping lag is relieved. Test this out only as a last resort.

r_vsync
VSync prevents screen tearing. If you don’t know what that is, just set it to “0” because you probably don’t care anyway. Otherwise, VSync usually doesn’t have any negative performance issues with today’s graphics cards. However, there may be a few performance issues linked to VSync with the current release of Black Ops. Try setting this to “0” for compatibility.

r_blur_allowed
This setting enables Blur shader effects. If you have a strong shader card, this setting may be negligible. Otherwise, just go ahead and set this to “0”.

r_distortion
This setting enables Distortion shader effects. If you have a strong shader card, this setting may be negligible. Otherwise, just go ahead and set this to “0”.

r_dof_enable
This setting enables Depth of Field shader effects. If you have a strong shader card, this setting may be negligible. Otherwise, just go ahead and set this to “0”.

r_glow_allowed
This setting enables Glow (HDR?) shader effects. Normally, this should have a negligible performance impact. HOWEVER, this setting seems to be buggy! Performance improved DRAMATICALLY when I set this option to “0”.